was in fact inspired by
the Dyson's realistic many-body calculations [1]}.
In them, the arrow in Eq. (REF ) had only been
drawn in opposite direction,
\(\mathfrak {h}^{(Dyson)}\,\rightarrow \,H^{(Dyson)}= \Omega ^{-1}\,\mathfrak {h}^{(Dyson)}\,\Omega \,.\) 
